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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Debt Redemptions/Repayments (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 02, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 17, 2019 | Mar. 22, 2019 | Dec. 11, 2018 | Jul. 01, 2018 | Mar. 22, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  | $ 6,200 |  |
Debt Securities |  |  |  |  |  |  |  |  | $ 4,400 |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 1,530 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 7,300 |  | $ 7,300 |  |  |  |  |  |
Repayments of Long-term Debt, including breakage fees and all applicable accrued and unpaid interest |  | $ 4,600 |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 13 | $ 0 | $ 13 | $ 0 |  |  |  |  |
Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Transition Bond |  |  |  |  |  |  |  |  |  | $ 1,250 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 6.00% |
Senior Note 2.20 Percent Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.20% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 1,250 |  |  |  |
4.625% Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.625% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 474 |  |  |
3.625% Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 3.625% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 296 |  |  |
4.250% Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.25% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 163 |  |  |
2.800% Notes due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 2.80% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 381 |  |  |
6.500% Debentures due 2028 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 6.50% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 57 |  |  |
5.600% Senior Notes due 2036 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 5.60% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 42 |  |  |
4.900% Notes due 2041 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.90% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 48 |  |  |
4.150% Notes due 2043 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.15% |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 69 |  |  |
Senior Note Floating Rate Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 750 |  |  |  |
SMR notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  | $ 2,000 |  |  |  |
Term Loan Facility due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] |  |  |  |  |  |  |  |  |  | $ 4,500
Long-term Line of Credit | [1] | $ 3,000 |  |  |  |  |  |  |  |  |
[1] | The Term Loan Facility was amended in 2018 to extend the maturity date to June 2020 and the facility was repaid and terminated in May 2019.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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